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<p>&#x5BF9;&#x4E8E;&#x5927;&#x591A;&#x6570;&#x8BED;&#x8A00;&#xFF0C;&#x4ED6;&#x4EEC;&#x90FD;&#x4F7F;&#x7528;&#x4E86;<strong>&#x8FD0;&#x884C;&#x65F6;&#x7CFB;&#x7EDF;</strong>&#xFF08;Runtime System&#xFF09;&#xFF0C;&#x8FD9;&#x53EF;&#x80FD;&#x5BFC;&#x81F4; <code>main</code> &#x51FD;&#x6570;&#x5E76;&#x4E0D;&#x662F;&#x5B9E;&#x9645;&#x6267;&#x884C;&#x7684;&#x7B2C;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x4EE5; Rust &#x8BED;&#x8A00;&#x4E3A;&#x4F8B;&#xFF0C;&#x4E00;&#x4E2A;&#x5178;&#x578B;&#x7684;&#x94FE;&#x63A5;&#x4E86;&#x6807;&#x51C6;&#x5E93;&#x7684; Rust &#x7A0B;&#x5E8F;&#x4F1A;&#x9996;&#x5148;&#x8DF3;&#x8F6C;&#x5230; C &#x8BED;&#x8A00;&#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x4E2D;&#x7684; <code>crt0</code>&#xFF08;C Runtime Zero&#xFF09;&#x8FDB;&#x5165; C &#x8BED;&#x8A00;&#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x8BBE;&#x7F6E; C &#x7A0B;&#x5E8F;&#x8FD0;&#x884C;&#x6240;&#x9700;&#x8981;&#x7684;&#x73AF;&#x5883;&#xFF08;&#x5982;&#x521B;&#x5EFA;&#x5806;&#x6808;&#x6216;&#x8BBE;&#x7F6E;&#x5BC4;&#x5B58;&#x5668;&#x53C2;&#x6570;&#x7B49;&#xFF09;&#x3002;</p>
<p>&#x7136;&#x540E; C &#x8BED;&#x8A00;&#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x4F1A;&#x8DF3;&#x8F6C;&#x5230; Rust &#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x7684;&#x5165;&#x53E3;&#x70B9;&#xFF08;Entry Point&#xFF09;&#x8FDB;&#x5165; Rust &#x8FD0;&#x884C;&#x65F6;&#x5165;&#x53E3;&#x51FD;&#x6570;&#x7EE7;&#x7EED;&#x8BBE;&#x7F6E; Rust &#x8FD0;&#x884C;&#x73AF;&#x5883;&#xFF0C;&#x800C;&#x8FD9;&#x4E2A; Rust &#x7684;&#x8FD0;&#x884C;&#x65F6;&#x5165;&#x53E3;&#x70B9;&#x5C31;&#x662F;&#x88AB; <code>start</code> &#x8BED;&#x4E49;&#x9879;&#x6807;&#x8BB0;&#x7684;&#x3002;Rust &#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x7684;&#x5165;&#x53E3;&#x70B9;&#x7ED3;&#x675F;&#x4E4B;&#x540E;&#x624D;&#x4F1A;&#x8C03;&#x7528; <code>main</code> &#x51FD;&#x6570;&#x8FDB;&#x5165;&#x4E3B;&#x7A0B;&#x5E8F;&#x3002;</p>
<p>C &#x8BED;&#x8A00;&#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x548C; Rust &#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x90FD;&#x9700;&#x8981;&#x6807;&#x51C6;&#x5E93;&#x652F;&#x6301;&#xFF0C;&#x6211;&#x4EEC;&#x7684;&#x7A0B;&#x5E8F;&#x65E0;&#x6CD5;&#x8BBF;&#x95EE;&#x3002;&#x5982;&#x679C;&#x8986;&#x76D6;&#x4E86; <code>start</code> &#x8BED;&#x4E49;&#x9879;&#xFF0C;&#x4ECD;&#x7136;&#x9700;&#x8981; <code>crt0</code>&#xFF0C;&#x5E76;&#x4E0D;&#x80FD;&#x89E3;&#x51B3;&#x95EE;&#x9898;&#x3002;&#x6240;&#x4EE5;&#x9700;&#x8981;&#x91CD;&#x5199;&#x8986;&#x76D6;&#x6574;&#x4E2A; <code>crt0</code> &#x5165;&#x53E3;&#x70B9;&#xFF1A;</p>
<p></p><p class="code-label">os/src/main.rs</p><p></p>
<pre><code class="lang-rust"><span class="hljs-comment">//! # &#x5168;&#x5C40;&#x5C5E;&#x6027;</span>
<span class="hljs-comment">//! - `#![no_std]`  </span>
<span class="hljs-comment">//!   &#x7981;&#x7528;&#x6807;&#x51C6;&#x5E93;</span>
<span class="hljs-meta">#![no_std]</span>
<span class="hljs-comment">//!</span>
<span class="hljs-comment">//! - `#![no_main]`  </span>
<span class="hljs-comment">//!   &#x4E0D;&#x4F7F;&#x7528; `main` &#x51FD;&#x6570;&#x7B49;&#x5168;&#x90E8; Rust-level &#x5165;&#x53E3;&#x70B9;&#x6765;&#x4F5C;&#x4E3A;&#x7A0B;&#x5E8F;&#x5165;&#x53E3;</span>
<span class="hljs-meta">#![no_main]</span>

<span class="hljs-keyword">use</span> core::panic::PanicInfo;

<span class="hljs-comment">/// &#x5F53; panic &#x53D1;&#x751F;&#x65F6;&#x4F1A;&#x8C03;&#x7528;&#x8BE5;&#x51FD;&#x6570;</span>
<span class="hljs-comment">/// &#x6211;&#x4EEC;&#x6682;&#x65F6;&#x5C06;&#x5B83;&#x7684;&#x5B9E;&#x73B0;&#x4E3A;&#x4E00;&#x4E2A;&#x6B7B;&#x5FAA;&#x73AF;</span>
<span class="hljs-meta">#[panic_handler]</span>
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">panic</span></span>(_info: &amp;PanicInfo) -&gt; ! {
    <span class="hljs-keyword">loop</span> {}
}

<span class="hljs-comment">/// &#x8986;&#x76D6; crt0 &#x4E2D;&#x7684; _start &#x51FD;&#x6570;</span>
<span class="hljs-comment">/// &#x6211;&#x4EEC;&#x6682;&#x65F6;&#x5C06;&#x5B83;&#x7684;&#x5B9E;&#x73B0;&#x4E3A;&#x4E00;&#x4E2A;&#x6B7B;&#x5FAA;&#x73AF;</span>
<span class="hljs-meta">#[no_mangle]</span>
<span class="hljs-keyword">pub</span> <span class="hljs-keyword">extern</span> <span class="hljs-string">&quot;C&quot;</span> <span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">_start</span></span>() -&gt; ! {
    <span class="hljs-keyword">loop</span> {}
}
</code></pre>
<p>&#x6211;&#x4EEC;&#x52A0;&#x4E0A; <code>#![no_main]</code> &#x544A;&#x8BC9;&#x7F16;&#x8BD1;&#x5668;&#x6211;&#x4EEC;&#x4E0D;&#x7528;&#x5E38;&#x89C4;&#x7684;&#x5165;&#x53E3;&#x70B9;&#x3002;</p>
<p>&#x540C;&#x65F6;&#x6211;&#x4EEC;&#x5B9E;&#x73B0;&#x4E00;&#x4E2A; <code>_start</code> &#x51FD;&#x6570;&#x6765;&#x4EE3;&#x66FF; <code>crt0</code>&#xFF0C;&#x5E76;&#x52A0;&#x4E0A; <code>#[no_mangle]</code> &#x544A;&#x8BC9;&#x7F16;&#x8BD1;&#x5668;&#x5BF9;&#x4E8E;&#x6B64;&#x51FD;&#x6570;&#x7981;&#x7528;&#x7F16;&#x8BD1;&#x671F;&#x95F4;&#x7684;&#x540D;&#x79F0;&#x91CD;&#x6574;&#xFF08;Name Mangling&#xFF09;&#xFF0C;&#x5373;&#x786E;&#x4FDD;&#x7F16;&#x8BD1;&#x5668;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x540D;&#x4E3A; <code>_start</code> &#x7684;&#x51FD;&#x6570;&#xFF0C;&#x800C;&#x975E;&#x4E3A;&#x4E86;&#x5B9E;&#x73B0;&#x51FD;&#x6570;&#x91CD;&#x8F7D;&#x7B49;&#x800C;&#x751F;&#x6210;&#x7684;&#x5F62;&#x5982; <code>_ZN3blog_os4_start7hb173fedf945531caE</code> &#x6563;&#x5217;&#x5316;&#x540E;&#x7684;&#x51FD;&#x6570;&#x540D;&#x3002;&#x7531;&#x4E8E; <code>_start</code> &#x662F;&#x5927;&#x591A;&#x6570;&#x7CFB;&#x7EDF;&#x7684;&#x9ED8;&#x8BA4;&#x5165;&#x53E3;&#x70B9;&#x540D;&#x5B57;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x8981;&#x786E;&#x4FDD;&#x5B83;&#x4E0D;&#x4F1A;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x3002;</p>
<p>&#x63A5;&#x7740;&#xFF0C;&#x6211;&#x4EEC;&#x4F7F;&#x7528; <code>extern &quot;C&quot;</code> &#x63CF;&#x8FF0; <code>_start</code> &#x51FD;&#x6570;&#xFF0C;&#x8FD9;&#x662F; Rust &#x4E2D;&#x7684; FFI &#xFF08;Foreign Function Interface, &#x8BED;&#x8A00;&#x4EA4;&#x4E92;&#x63A5;&#x53E3;&#xFF09;&#x8BED;&#x6CD5;&#xFF0C;&#x8868;&#x793A;&#x6B64;&#x51FD;&#x6570;&#x662F;&#x4E00;&#x4E2A; C &#x51FD;&#x6570;&#x800C;&#x975E; Rust &#x51FD;&#x6570;&#x3002;&#x7531;&#x4E8E; <code>_start</code> &#x662F;&#x4F5C;&#x4E3A; C &#x8BED;&#x8A00;&#x8FD0;&#x884C;&#x65F6;&#x7684;&#x5165;&#x53E3;&#x70B9;&#xFF0C;&#x770B;&#x8D77;&#x6765;&#x5408;&#x60C5;&#x5408;&#x7406;&#x3002;</p>
<p>&#x7531;&#x4E8E;&#x7A0B;&#x5E8F;&#x4F1A;&#x4E00;&#x76F4;&#x505C;&#x5728; <code>crt0</code> &#x7684;&#x5165;&#x53E3;&#x70B9;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x79FB;&#x9664;&#x6CA1;&#x7528;&#x7684; <code>main</code> &#x51FD;&#x6570;&#x3002;</p>
<h3 id="&#x94FE;&#x63A5;&#x9519;&#x8BEF;">&#x94FE;&#x63A5;&#x9519;&#x8BEF;</h3>
<p>&#x518D;&#x6B21; <code>cargo build</code> &#xFF0C;&#x6211;&#x4EEC;&#x4F1A;&#x770B;&#x5230;&#x4E00;&#x5927;&#x6BB5;&#x94FE;&#x63A5;&#x9519;&#x8BEF;&#x3002;</p>
<p>&#x94FE;&#x63A5;&#x5668;&#xFF08;Linker&#xFF09;&#x662F;&#x4E00;&#x4E2A;&#x7A0B;&#x5E8F;&#xFF0C;&#x5B83;&#x5C06;&#x751F;&#x6210;&#x7684;&#x76EE;&#x6807;&#x6587;&#x4EF6;&#x7EC4;&#x5408;&#x4E3A;&#x4E00;&#x4E2A;&#x53EF;&#x6267;&#x884C;&#x6587;&#x4EF6;&#x3002;&#x4E0D;&#x540C;&#x7684;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x5982; Windows&#x3001;macOS &#x6216; Linux&#xFF0C;&#x89C4;&#x5B9A;&#x4E86;&#x4E0D;&#x540C;&#x7684;&#x53EF;&#x6267;&#x884C;&#x6587;&#x4EF6;&#x683C;&#x5F0F;&#xFF0C;&#x56E0;&#x6B64;&#x4E5F;&#x5404;&#x6709;&#x81EA;&#x5DF1;&#x7684;&#x94FE;&#x63A5;&#x5668;&#xFF0C;&#x629B;&#x51FA;&#x4E0D;&#x540C;&#x7684;&#x9519;&#x8BEF;&#xFF1B;&#x4F46;&#x8FD9;&#x4E9B;&#x9519;&#x8BEF;&#x7684;&#x6839;&#x672C;&#x539F;&#x56E0;&#x8FD8;&#x662F;&#x76F8;&#x540C;&#x7684;&#xFF1A;&#x94FE;&#x63A5;&#x5668;&#x7684;&#x9ED8;&#x8BA4;&#x914D;&#x7F6E;&#x5047;&#x5B9A;&#x7A0B;&#x5E8F;&#x4F9D;&#x8D56;&#x4E8E; C &#x8BED;&#x8A00;&#x7684;&#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#xFF0C;&#x4F46;&#x6211;&#x4EEC;&#x7684;&#x7A0B;&#x5E8F;&#x5E76;&#x4E0D;&#x4F9D;&#x8D56;&#x4E8E;&#x5B83;&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x9519;&#x8BEF;&#xFF0C;&#x6211;&#x4EEC;&#x9700;&#x8981;&#x544A;&#x8BC9;&#x94FE;&#x63A5;&#x5668;&#xFF0C;&#x5B83;&#x4E0D;&#x5E94;&#x8BE5;&#x5305;&#x542B; C &#x8BED;&#x8A00;&#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x3002;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x9009;&#x62E9;&#x63D0;&#x4F9B;&#x7279;&#x5B9A;&#x7684;&#x94FE;&#x63A5;&#x5668;&#x53C2;&#x6570;&#xFF08;Linker Argument&#xFF09;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x9009;&#x62E9;&#x7F16;&#x8BD1;&#x4E3A;&#x88F8;&#x673A;&#x76EE;&#x6807;&#xFF08;Bare Metal Target&#xFF09;&#xFF0C;&#x6211;&#x4EEC;&#x5C06;&#x6CBF;&#x7740;&#x540E;&#x8005;&#x7684;&#x601D;&#x8DEF;&#x5728;&#x540E;&#x9762;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;&#x5373;&#x76F4;&#x63A5;&#x7F16;&#x8BD1;&#x4E3A;&#x88F8;&#x673A;&#x76EE;&#x6807;&#x4E0D;&#x94FE;&#x63A5;&#x4EFB;&#x4F55;&#x8FD0;&#x884C;&#x65F6;&#x73AF;&#x5883;&#x3002;
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